SUMMARY: NASA's Mars Global Surveyor spacecraft has revealed new features on Mars that look like ancient river deltas. This discovery might help answer the mystery of how long water flowed on the surface of the Red Planet. The shape of this formation suggests that a river flowed into a body of water for quite a while, changing its course and building up layers of sediment over time. The area is about 13 km long and 11 km wide, and located in a crater in the southern hemisphere.
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